Furnace-grate



(No Model.) 2 Sheets-Sheet 1.

G W WOOD FURNACE GRATE.

Patented Aug. 25, 1891.

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(No Model.) v 2 Sheets-Sheet 2.

G. W. WO0D. FURNACE GRATE. N0.'458,Z Qf 3 Patented Aug. 25, 1891.

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UNITED STATES PATENT OFFICE.

GEORGE IV. IVOOD, OF PHILADELPHIA, PENNSYLVANIA.

FURNACE -GRATE.

SPECIFICATION forming part of Letters Patent No. 458,208, dated August25, 1891.

Application filed October 23, 1890. Serial No. 369,036. (No model.)

To all whom it may concern;

Be it known that I, GEORGE IV. WOOD, of the city and county ofPhiladelphia, State of Pennsylvania, have invented a certain new anduseful Improved Furnace Grate, of which the following is a true andexact description, reference being had to the accompanying drawings,which form a part of this specification.

My invention relates particularly to the construction of furnacegratesadapted for burning cnlm or other finely-divided fuel, although in someparticulars it is also fitted for use with other fuels.

My object is to provide a grate the bars of which, preferably set in aninclined series, shall be moved seriatim, or one after the other, so asto break up the fuel resting upon them, keeping it sufficiently open forthe passage of air through it, and also gradually move it downwardtoward the bottom of the grate, where dumping mechanism should beprovided.

The nature of my invention will be best understood as described inconnection with the drawings in which it is illustrated, and in whichFigure l is a front view, partly in section, of a furnace provided withmy improvement in what I believe to be its best form; Fig. 2, alongitudinal section on the line 7 8 of Fig; 1; and Figs. 3, 4, and dareenlarged views of details of the mechanism. 7

A represents the furnace-chamber; l), a boiler situated therein; 0, anash-pit; D, an opening or door in front of the furnace; E, a box ortrough set in the side of the furnace, over the front edge of whichthe-finely-divided fuel falls upon the edge of the grate below; E, achute leading into the outer end of the said trough; E, aconveying-screw situated in the trough E and having a perforated shaft,as shown, which communicates with an air-blast pipe F and upon which issecured a sprocket-wheel G, which is rotated by means of a drive-chainG, actuated by any connecting mechanism. (Not shown in the drawings.)

F is an air-blast conduit, from which a branch F leads beneath thegrate, and from which pipe F also leads.

H H are iron bars secured to the front and back of the furnace in aninclined position, as shown, and provided with journal-bearings h. Inorder to allow for expansion, I prefer to firmly secure only the lowerends of these bars to the furnace, allowing the upper ends to rest onfriction-rollers t', which in turn rest on a plate I, set in the wall ofthe furnace.

J J J &c., represent the grate-bars, which are provided at each end withjournals j, which rest in the journal-bearings h. Each of the bars isprovided with a downwardly projecting arm K, on the end of which mayconveniently be secured an anti-friction roller K. At the lower end ofthe series of inclined grate-bars I secure dumping-grates O O, andpreferably these clumping-grates are in the center of the furnace, withan inclined series of bars J J, to, extending upward on each side.

As shown, the dumping-grates 0 are secured to a pivoted bar 0 andprovided with a downwardly-extending arm 0, to the end of which armsrods P P are secured, by pulling on which the grates O O can be causedto tilt and dump the material resting upon them into the ash-pit.

To return to the inclined series of grate bars, it will be noticed thateach bar is independent of the others, and I combine with them a seriesof cams, each adapted to engage one of the downwardly-projecting armsand actuate it so as to give the grate-bar an oscillating movement, thecams being preferably arranged so as to come into action seriatim,moving one bar after the other. Any convenient means for actuating thecams may be employed; but preferably I use a construction such as isshown in the drawings, a shaft L being j ournaled beneath the inclinedgrate and having secured upon it a series of cams N N N &c.,each havingtwo operative faces a and at, one of which pushes the arm K in onedirection and the other of which pushes it back to the point of rest. Asthe shaft L is rotated these cams engage the arms K of the bars J J,&c.,one after the other, causing first one bar to oscillate and thenanother, until the whole series is moved, and then again beginning withthe first bar. I11 this way a continuous breaking up of the fuel-bed isinsured, and at the same time the fuel is caused to move slowly downtoward the dumping-grates at the bottom of the inclined series.

The rotation of the shaft L is conveniently effected, as shown in thedrawings-that is, by securing to it a ratchetqvheel L and also pivotingupon it a rock-lever L on the end of which a pawl Z is secured so as toengage with the teeth of the ratchet-wheel. The rock-lever is actuatedbymeans of a connecting-rod M, extending through the front of thefurnace and secured to one end of a pivoted bell-crank lever M. Upon theother arm of the lever an adjustable sleeve on is secured, and to thissleeve a reciprocating rod M is fastened. As shown, the desiredreciprocation is given to this rod by securing its other end to aneccentric-strap M which in turn is secured upon an eccentric h fastenedto the shaft E By having the sleeve m adjustable the rapidity with whichthe shaft L is rotated can be regulated, and by withdrawing the sleevethe lever B can be actuated by hand.

The mechanism shown and described for feeding in culm or otherculmunated fuel forms no part of my present invention, being the subjeat-matter of another application filed by me July 28, 1890, and bearingthe Serial No. 360,179.

Having now described my invention, whatI claim as new, and desire tosecure by Letters Patent, is

1. In a furnace-grate, a series of pivoted oscillating grate-bars, as JJ, (to, having bearings at each end and having downwardlypxtending arms,in oombinationwith a series of cams each adapted to engage one of thegratebar arms and oscillate the bar in its bearings and arranged to comeinto operation one after the other, so as to oscillate the bars sem'cttim.

2. In a furnace-grate, one or more series of pivoted oscillatinggrate-bars, as J J, &c., set on an incline extending down from the sideof the furnace and each bar of the inclined series having adownwardly-extending arm,

in combination with a dumping-grate situated at the bottom of theinclined series, a device for feeding in culm or similar fuel, situatedabove the upper end of the series of gratebars, a series of camsarranged to engage the arms of the bars and oscillate them seria tim,and means for actuating said cams.

3. Ina furnace-grate, the combination of a series of pivoted oscillatinggrate-bars, each having a downwardly-extending arm with a rotatingshaft, and a series of cams secured to said shaft and each adapted toengage one of the grate-bar arms and give it an oscillating motion, saidcams being arranged to come into operation one after the other, so as toactuate the bars seriatim.

4. In afurnace-grate, the combination of the pivoted oscillatinggrate-bars havingarms, as K, a shaft L, having a series of cams securedthereon and arranged to oscillate the grate-bars, as described, aratchet-wheel L, secured to shaft L, a rock-lever L pivoted to shaft L,a pawl Z, secured to lever L and adapted to engage ratchet L, aconnectingrod M, attached to lever L and extending to the front of thefurnace, and a lever, as M, pivoted to red M.

5. In a furnace-grate, the combination of the pivotedoscillatinggrate-bars having arms, as K, a shaft L, having a series of cams securedthereon and arranged to oscillate the grate-bars, as described, aratchet-wheel L, secured to shaft L, a rock-lever L pivoted to shaft L,a pawl Z, secured to lever L and adapted to engage ratchet L, aconnectingrod M, attached to lever L and extending to the front of thefurnace, a lever, as M, pivoted to rodM', an adjustable sleeve m onlever M, and a reciprocating rod M attached to said sleeve.

GEORGE \V. \VOOD.

\Vitnesses:

GEORGE HOUSE, JOSHUA MATLAcK, Jr.

